Knife block



FIG. 1 is a front, left side perspective view of a knife block, showing my new design.

FIG. 2. is a right side view thereof.

FIG. 3 is a left side view thereof.

FIG. 4 is a top plan view thereof.

FIG. 5. is a bottom plan view thereof.

FIG. 6 is a rear view thereof; and,

FIG. 7 is a front view thereof.

The broken line portions show uncalimed subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a knife block, as shown and described. 